/* OSPFv2 SNMP support
 * Copyright (C) 2000 IP Infusion Inc.
 *
 * Written by Kunihiro Ishiguro <kunihiro@zebra.org>
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#include <zebra.h>

#ifdef HAVE_SNMP
#include <asn1.h>
#include <snmp.h>
#include <snmp_impl.h>

#include "if.h"
#include "log.h"
#include "prefix.h"
#include "table.h"
#include "command.h"
#include "memory.h"
#include "smux.h"

#include "ospfd/ospfd.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_abr.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_nsm.h"
#include "ospfd/ospf_flood.h"

/* OSPF2-MIB. */
#define OSPF2MIB 1,3,6,1,2,1,14

/* Zebra enterprise OSPF MIB.  This variable is used for register
   OSPF MIB to SNMP agent under SMUX protocol.  */
#define OSPFDOID 1,3,6,1,4,1,3317,1,2,5

/* OSPF MIB General Group values. */
#define OSPFROUTERID                     1
#define OSPFADMINSTAT                    2
#define OSPFVERSIONNUMBER                3
#define OSPFAREABDRRTRSTATUS             4
#define OSPFASBDRRTRSTATUS               5
#define OSPFEXTERNLSACOUNT               6
#define OSPFEXTERNLSACKSUMSUM            7
#define OSPFTOSSUPPORT                   8
#define OSPFORIGINATENEWLSAS             9
#define OSPFRXNEWLSAS                    10
#define OSPFEXTLSDBLIMIT                 11
#define OSPFMULTICASTEXTENSIONS          12
#define OSPFEXITOVERFLOWINTERVAL         13
#define OSPFDEMANDEXTENSIONS             14

/* OSPF MIB ospfAreaTable. */
#define OSPFAREAID                       1
#define OSPFAUTHTYPE                     2
#define OSPFIMPORTASEXTERN               3
#define OSPFSPFRUNS                      4
#define OSPFAREABDRRTRCOUNT              5
#define OSPFASBDRRTRCOUNT                6
#define OSPFAREALSACOUNT                 7
#define OSPFAREALSACKSUMSUM              8
#define OSPFAREASUMMARY                  9
#define OSPFAREASTATUS                   10

/* OSPF MIB ospfStubAreaTable. */
#define OSPFSTUBAREAID                   1
#define OSPFSTUBTOS                      2
#define OSPFSTUBMETRIC                   3
#define OSPFSTUBSTATUS                   4
#define OSPFSTUBMETRICTYPE               5

/* OSPF MIB ospfLsdbTable. */
#define OSPFLSDBAREAID                   1
#define OSPFLSDBTYPE                     2
#define OSPFLSDBLSID                     3
#define OSPFLSDBROUTERID                 4
#define OSPFLSDBSEQUENCE                 5
#define OSPFLSDBAGE                      6
#define OSPFLSDBCHECKSUM                 7
#define OSPFLSDBADVERTISEMENT            8

/* OSPF MIB ospfAreaRangeTable. */
#define OSPFAREARANGEAREAID              1
#define OSPFAREARANGENET                 2
#define OSPFAREARANGEMASK                3
#define OSPFAREARANGESTATUS              4
#define OSPFAREARANGEEFFECT              5

/* OSPF MIB ospfHostTable. */
#define OSPFHOSTIPADDRESS                1
#define OSPFHOSTTOS                      2
#define OSPFHOSTMETRIC                   3
#define OSPFHOSTSTATUS                   4
#define OSPFHOSTAREAID                   5

/* OSPF MIB ospfIfTable. */
#define OSPFIFIPADDRESS                  1
#define OSPFADDRESSLESSIF                2
#define OSPFIFAREAID                     3
#define OSPFIFTYPE                       4
#define OSPFIFADMINSTAT                  5
#define OSPFIFRTRPRIORITY                6
#define OSPFIFTRANSITDELAY               7
#define OSPFIFRETRANSINTERVAL            8
#define OSPFIFHELLOINTERVAL              9
#define OSPFIFRTRDEADINTERVAL            10
#define OSPFIFPOLLINTERVAL               11
#define OSPFIFSTATE                      12
#define OSPFIFDESIGNATEDROUTER           13
#define OSPFIFBACKUPDESIGNATEDROUTER     14
#define OSPFIFEVENTS                     15
#define OSPFIFAUTHKEY                    16
#define OSPFIFSTATUS                     17
#define OSPFIFMULTICASTFORWARDING        18
#define OSPFIFDEMAND                     19
#define OSPFIFAUTHTYPE                   20

/* OSPF MIB ospfIfMetricTable. */
#define OSPFIFMETRICIPADDRESS            1
#define OSPFIFMETRICADDRESSLESSIF        2
#define OSPFIFMETRICTOS                  3
#define OSPFIFMETRICVALUE                4
#define OSPFIFMETRICSTATUS               5

/* OSPF MIB ospfVirtIfTable. */
#define OSPFVIRTIFAREAID                 1
#define OSPFVIRTIFNEIGHBOR               2
#define OSPFVIRTIFTRANSITDELAY           3
#define OSPFVIRTIFRETRANSINTERVAL        4
#define OSPFVIRTIFHELLOINTERVAL          5
#define OSPFVIRTIFRTRDEADINTERVAL        6
#define OSPFVIRTIFSTATE                  7
#define OSPFVIRTIFEVENTS                 8
#define OSPFVIRTIFAUTHKEY                9
#define OSPFVIRTIFSTATUS                 10
#define OSPFVIRTIFAUTHTYPE               11

/* OSPF MIB ospfNbrTable. */
#define OSPFNBRIPADDR                    1
#define OSPFNBRADDRESSLESSINDEX          2
#define OSPFNBRRTRID                     3
#define OSPFNBROPTIONS                   4
#define OSPFNBRPRIORITY                  5
#define OSPFNBRSTATE                     6
#define OSPFNBREVENTS                    7
#define OSPFNBRLSRETRANSQLEN             8
#define OSPFNBMANBRSTATUS                9
#define OSPFNBMANBRPERMANENCE            10
#define OSPFNBRHELLOSUPPRESSED           11

/* OSPF MIB ospfVirtNbrTable. */
#define OSPFVIRTNBRAREA                  1
#define OSPFVIRTNBRRTRID                 2
#define OSPFVIRTNBRIPADDR                3
#define OSPFVIRTNBROPTIONS               4
#define OSPFVIRTNBRSTATE                 5
#define OSPFVIRTNBREVENTS                6
#define OSPFVIRTNBRLSRETRANSQLEN         7
#define OSPFVIRTNBRHELLOSUPPRESSED       8

/* OSPF MIB ospfExtLsdbTable. */
#define OSPFEXTLSDBTYPE                  1
#define OSPFEXTLSDBLSID                  2
#define OSPFEXTLSDBROUTERID              3
#define OSPFEXTLSDBSEQUENCE              4
#define OSPFEXTLSDBAGE                   5
#define OSPFEXTLSDBCHECKSUM              6
#define OSPFEXTLSDBADVERTISEMENT         7

/* OSPF MIB ospfAreaAggregateTable. */
#define OSPFAREAAGGREGATEAREAID          1
#define OSPFAREAAGGREGATELSDBTYPE        2
#define OSPFAREAAGGREGATENET             3
#define OSPFAREAAGGREGATEMASK            4
#define OSPFAREAAGGREGATESTATUS          5
#define OSPFAREAAGGREGATEEFFECT          6

/* SYNTAX Status from OSPF-MIB. */
#define OSPF_STATUS_ENABLED  1
#define OSPF_STATUS_DISABLED 2

/* SNMP value hack. */
#define COUNTER     ASN_COUNTER
#define INTEGER     ASN_INTEGER
#define GAUGE       ASN_GAUGE
#define TIMETICKS   ASN_TIMETICKS
#define IPADDRESS   ASN_IPADDRESS
#define STRING      ASN_OCTET_STR

/* Declare static local variables for convenience. */
SNMP_LOCAL_VARIABLES

/* OSPF-MIB instances. */
oid ospf_oid [] = { OSPF2MIB };
oid ospfd_oid [] = { OSPFDOID };

/* IP address 0.0.0.0. */
static struct in_addr ospf_empty_addr = {0};

/* Hook functions. */
static u_char *ospfGeneralGroup ();
static u_char *ospfAreaEntry ();
static u_char *ospfStubAreaEntry ();
static u_char *ospfLsdbEntry ();
static u_char *ospfAreaRangeEntry ();
static u_char *ospfHostEntry ();
static u_char *ospfIfEntry ();
static u_char *ospfIfMetricEntry ();
static u_char *ospfVirtIfEntry ();
static u_char *ospfNbrEntry ();
static u_char *ospfVirtNbrEntry ();
static u_char *ospfExtLsdbEntry ();
static u_char *ospfAreaAggregateEntry ();

struct variable ospf_variables[] = 
{
  /* OSPF general variables */
  {OSPFROUTERID,              IPADDRESS, RWRITE, ospfGeneralGroup,
   2, {1, 1}},
  {OSPFADMINSTAT,             INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 2}},
  {OSPFVERSIONNUMBER,         INTEGER, RONLY, ospfGeneralGroup,
   2, {1, 3}},
  {OSPFAREABDRRTRSTATUS,      INTEGER, RONLY, ospfGeneralGroup,
   2, {1, 4}},
  {OSPFASBDRRTRSTATUS,        INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 5}},
  {OSPFEXTERNLSACOUNT,        GAUGE, RONLY, ospfGeneralGroup,
   2, {1, 6}},
  {OSPFEXTERNLSACKSUMSUM,     INTEGER, RONLY, ospfGeneralGroup,
   2, {1, 7}},
  {OSPFTOSSUPPORT,            INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 8}},
  {OSPFORIGINATENEWLSAS,      COUNTER, RONLY, ospfGeneralGroup,
   2, {1, 9}},
  {OSPFRXNEWLSAS,             COUNTER, RONLY, ospfGeneralGroup,
   2, {1, 10}},
  {OSPFEXTLSDBLIMIT,          INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 11}},
  {OSPFMULTICASTEXTENSIONS,   INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 12}},
  {OSPFEXITOVERFLOWINTERVAL,  INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 13}},
  {OSPFDEMANDEXTENSIONS,      INTEGER, RWRITE, ospfGeneralGroup,
   2, {1, 14}},

  /* OSPF area data structure. */
  {OSPFAREAID,                IPADDRESS, RONLY, ospfAreaEntry,
   3, {2, 1, 1}},
  {OSPFAUTHTYPE,              INTEGER, RWRITE, ospfAreaEntry,
   3, {2, 1, 2}},
  {OSPFIMPORTASEXTERN,        INTEGER, RWRITE, ospfAreaEntry,
   3, {2, 1, 3}},
  {OSPFSPFRUNS,               COUNTER, RONLY, ospfAreaEntry,
   3, {2, 1, 4}},
  {OSPFAREABDRRTRCOUNT,       GAUGE, RONLY, ospfAreaEntry,
   3, {2, 1, 5}},
  {OSPFASBDRRTRCOUNT,         GAUGE, RONLY, ospfAreaEntry,
   3, {2, 1, 6}},
  {OSPFAREALSACOUNT,          GAUGE, RONLY, ospfAreaEntry,
   3, {2, 1, 7}},
  {OSPFAREALSACKSUMSUM,       INTEGER, RONLY, ospfAreaEntry,
   3, {2, 1, 8}},
  {OSPFAREASUMMARY,           INTEGER, RWRITE, ospfAreaEntry,
   3, {2, 1, 9}},
  {OSPFAREASTATUS,            INTEGER, RWRITE, ospfAreaEntry,
   3, {2, 1, 10}},

  /* OSPF stub area information. */
  {OSPFSTUBAREAID,            IPADDRESS, RONLY, ospfStubAreaEntry,
   3, {3, 1, 1}},
  {OSPFSTUBTOS,               INTEGER, RONLY, ospfStubAreaEntry,
   3, {3, 1, 2}},
  {OSPFSTUBMETRIC,            INTEGER, RWRITE, ospfStubAreaEntry,
   3, {3, 1, 3}},
  {OSPFSTUBSTATUS,            INTEGER, RWRITE, ospfStubAreaEntry,
   3, {3, 1, 4}},
  {OSPFSTUBMETRICTYPE,        INTEGER, RWRITE, ospfStubAreaEntry,
   3, {3, 1, 5}},

  /* OSPF link state database. */
  {OSPFLSDBAREAID,            IPADDRESS, RONLY, ospfLsdbEntry,
   3, {4, 1, 1}},
  {OSPFLSDBTYPE,              INTEGER, RONLY, ospfLsdbEntry,
   3, {4, 1, 2}},
  {OSPFLSDBLSID,              IPADDRESS, RONLY, ospfLsdbEntry,
   3, {4, 1, 3}},
  {OSPFLSDBROUTERID,          IPADDRESS, RONLY, ospfLsdbEntry,
   3, {4, 1, 4}},
  {OSPFLSDBSEQUENCE,          INTEGER, RONLY, ospfLsdbEntry,
   3, {4, 1, 5}},
  {OSPFLSDBAGE,               INTEGER, RONLY, ospfLsdbEntry,
   3, {4, 1, 6}},
  {OSPFLSDBCHECKSUM,          INTEGER, RONLY, ospfLsdbEntry,
   3, {4, 1, 7}},
  {OSPFLSDBADVERTISEMENT,     STRING, RONLY, ospfLsdbEntry,
   3, {4, 1, 8}},

  /* Area range table. */
  {OSPFAREARANGEAREAID,       IPADDRESS, RONLY, ospfAreaRangeEntry,
   3, {5, 1, 1}},
  {OSPFAREARANGENET,          IPADDRESS, RONLY, ospfAreaRangeEntry,
   3, {5, 1, 2}},
  {OSPFAREARANGEMASK,         IPADDRESS, RWRITE, ospfAreaRangeEntry,
   3, {5, 1, 3}},
  {OSPFAREARANGESTATUS,       INTEGER, RWRITE, ospfAreaRangeEntry,
   3, {5, 1, 4}},
  {OSPFAREARANGEEFFECT,       INTEGER, RWRITE, ospfAreaRangeEntry,
   3, {5, 1, 5}},

  /* OSPF host table. */
  {OSPFHOSTIPADDRESS,         IPADDRESS, RONLY, ospfHostEntry,
   3, {6, 1, 1}},
  {OSPFHOSTTOS,               INTEGER, RONLY, ospfHostEntry,
   3, {6, 1, 2}},
  {OSPFHOSTMETRIC,            INTEGER, RWRITE, ospfHostEntry,
   3, {6, 1, 3}},
  {OSPFHOSTSTATUS,            INTEGER, RWRITE, ospfHostEntry,
   3, {6, 1, 4}},
  {OSPFHOSTAREAID,            IPADDRESS, RONLY, ospfHostEntry,
   3, {6, 1, 5}},

  /* OSPF interface table. */
  {OSPFIFIPADDRESS,           IPADDRESS, RONLY, ospfIfEntry,
   3, {7, 1, 1}},
  {OSPFADDRESSLESSIF,         INTEGER, RONLY, ospfIfEntry,
   3, {7, 1, 2}},
  {OSPFIFAREAID,              IPADDRESS, RWRITE, ospfIfEntry,
   3, {7, 1, 3}},
  {OSPFIFTYPE,                INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 4}},
  {OSPFIFADMINSTAT,           INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 5}},
  {OSPFIFRTRPRIORITY,         INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 6}},
  {OSPFIFTRANSITDELAY,        INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 7}},
  {OSPFIFRETRANSINTERVAL,     INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 8}},
  {OSPFIFHELLOINTERVAL,       INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 9}},
  {OSPFIFRTRDEADINTERVAL,     INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 10}},
  {OSPFIFPOLLINTERVAL,        INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 11}},
  {OSPFIFSTATE,               INTEGER, RONLY, ospfIfEntry,
   3, {7, 1, 12}},
  {OSPFIFDESIGNATEDROUTER,    IPADDRESS, RONLY, ospfIfEntry,
   3, {7, 1, 13}},
  {OSPFIFBACKUPDESIGNATEDROUTER, IPADDRESS, RONLY, ospfIfEntry,
   3, {7, 1, 14}},
  {OSPFIFEVENTS,              COUNTER, RONLY, ospfIfEntry,
   3, {7, 1, 15}},
  {OSPFIFAUTHKEY,             STRING,  RWRITE, ospfIfEntry,
   3, {7, 1, 16}},
  {OSPFIFSTATUS,              INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 17}},
  {OSPFIFMULTICASTFORWARDING, INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 18}},
  {OSPFIFDEMAND,              INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 19}},
  {OSPFIFAUTHTYPE,            INTEGER, RWRITE, ospfIfEntry,
   3, {7, 1, 20}},

  /* OSPF interface metric table. */
  {OSPFIFMETRICIPADDRESS,     IPADDRESS, RONLY, ospfIfMetricEntry,
   3, {8, 1, 1}},
  {OSPFIFMETRICADDRESSLESSIF, INTEGER, RONLY, ospfIfMetricEntry,
   3, {8, 1, 2}},
  {OSPFIFMETRICTOS,           INTEGER, RONLY, ospfIfMetricEntry,
   3, {8, 1, 3}},
  {OSPFIFMETRICVALUE,         INTEGER, RWRITE, ospfIfMetricEntry,
   3, {8, 1, 4}},
  {OSPFIFMETRICSTATUS,        INTEGER, RWRITE, ospfIfMetricEntry,
   3, {8, 1, 5}},

  /* OSPF virtual interface table. */
  {OSPFVIRTIFAREAID,          IPADDRESS, RONLY, ospfVirtIfEntry,
   3, {9, 1, 1}},
  {OSPFVIRTIFNEIGHBOR,        IPADDRESS, RONLY, ospfVirtIfEntry,
   3, {9, 1, 2}},
  {OSPFVIRTIFTRANSITDELAY,    INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 3}},
  {OSPFVIRTIFRETRANSINTERVAL, INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 4}},
  {OSPFVIRTIFHELLOINTERVAL,   INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 5}},
  {OSPFVIRTIFRTRDEADINTERVAL, INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 6}},
  {OSPFVIRTIFSTATE,           INTEGER, RONLY, ospfVirtIfEntry,
   3, {9, 1, 7}},
  {OSPFVIRTIFEVENTS,          COUNTER, RONLY, ospfVirtIfEntry,
   3, {9, 1, 8}},
  {OSPFVIRTIFAUTHKEY,         STRING,  RWRITE, ospfVirtIfEntry,
   3, {9, 1, 9}},
  {OSPFVIRTIFSTATUS,          INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 10}},
  {OSPFVIRTIFAUTHTYPE,        INTEGER, RWRITE, ospfVirtIfEntry,
   3, {9, 1, 11}},

  /* OSPF neighbor table. */
  {OSPFNBRIPADDR,             IPADDRESS, RONLY, ospfNbrEntry,
   3, {10, 1, 1}},
  {OSPFNBRADDRESSLESSINDEX,   INTEGER, RONLY, ospfNbrEntry,
   3, {10, 1, 2}},
  {OSPFNBRRTRID,              IPADDRESS, RONLY, ospfNbrEntry,
   3, {10, 1, 3}},
  {OSPFNBROPTIONS,            INTEGER, RONLY, ospfNbrEntry,
   3, {10, 1, 4}},
  {OSPFNBRPRIORITY,           INTEGER, RWRITE, ospfNbrEntry,
   3, {10, 1, 5}},
  {OSPFNBRSTATE,              INTEGER, RONLY, ospfNbrEntry,
   3, {10, 1, 6}},
  {OSPFNBREVENTS,             COUNTER, RONLY, ospfNbrEntry,
   3, {10, 1, 7}},
  {OSPFNBRLSRETRANSQLEN,      GAUGE, RONLY, ospfNbrEntry,
   3, {10, 1, 8}},
  {OSPFNBMANBRSTATUS,         INTEGER, RWRITE, ospfNbrEntry,
   3, {10, 1, 9}},
  {OSPFNBMANBRPERMANENCE,     INTEGER, RONLY, ospfNbrEntry,
   3, {10, 1, 10}},
  {OSPFNBRHELLOSUPPRESSED,    INTEGER, RONLY, ospfNbrEntry,
   3, {10, 1, 11}},

  /* OSPF virtual neighbor table. */
  {OSPFVIRTNBRAREA,           IPADDRESS, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 1}},
  {OSPFVIRTNBRRTRID,          IPADDRESS, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 2}},
  {OSPFVIRTNBRIPADDR,         IPADDRESS, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 3}},
  {OSPFVIRTNBROPTIONS,        INTEGER, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 4}},
  {OSPFVIRTNBRSTATE,          INTEGER, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 5}},
  {OSPFVIRTNBREVENTS,         COUNTER, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 6}},
  {OSPFVIRTNBRLSRETRANSQLEN,  INTEGER, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 7}},
  {OSPFVIRTNBRHELLOSUPPRESSED, INTEGER, RONLY, ospfVirtNbrEntry,
   3, {11, 1, 8}},

  /* OSPF link state database, external. */
  {OSPFEXTLSDBTYPE,           INTEGER, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 1}},
  {OSPFEXTLSDBLSID,           IPADDRESS, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 2}},
  {OSPFEXTLSDBROUTERID,       IPADDRESS, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 3}},
  {OSPFEXTLSDBSEQUENCE,       INTEGER, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 4}},
  {OSPFEXTLSDBAGE,            INTEGER, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 5}},
  {OSPFEXTLSDBCHECKSUM,       INTEGER, RONLY, ospfExtLsdbEntry,
   3, {12, 1, 6}},
  {OSPFEXTLSDBADVERTISEMENT,  STRING,  RONLY, ospfExtLsdbEntry,
   3, {12, 1, 7}},

  /* OSPF area aggregate table. */
  {OSPFAREAAGGREGATEAREAID,   IPADDRESS, RONLY, ospfAreaAggregateEntry, 
   3, {14, 1, 1}},
  {OSPFAREAAGGREGATELSDBTYPE, INTEGER, RONLY, ospfAreaAggregateEntry, 
   3, {14, 1, 2}},
  {OSPFAREAAGGREGATENET,      IPADDRESS, RONLY, ospfAreaAggregateEntry, 
   3, {14, 1, 3}},
  {OSPFAREAAGGREGATEMASK,     IPADDRESS, RONLY, ospfAreaAggregateEntry, 
   3, {14, 1, 4}},
  {OSPFAREAAGGREGATESTATUS,   INTEGER, RWRITE, ospfAreaAggregateEntry,
   3, {14, 1, 5}},
  {OSPFAREAAGGREGATEEFFECT,   INTEGER, RWRITE, ospfAreaAggregateEntry,
   3, {14, 1, 6}}
};

/* The administrative status of OSPF.  When OSPF is enbled on at least
   one interface return 1. */
int
ospf_admin_stat ()
{
  listnode node;
  struct ospf_interface *oi;

  if (! ospf_top)
    return 0;

  for (node = listhead (ospf_top->oiflist); node; nextnode (node))
    {
      oi = getdata (node);

      if (oi && oi->address)
	return 1;
    }
  return 0;
}

static u_char *
ospfGeneralGroup (struct variable *v, oid *name, size_t *length,
		  int exact, size_t *var_len, WriteMethod **write_method)
{
  /* Check whether the instance identifier is valid */
  if (smux_header_generic (v, name, length, exact, var_len, write_method)
      == MATCH_FAILED)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFROUTERID:		/* 1 */
      /* Router-ID of this OSPF instance. */
      if (ospf_top)
	return SNMP_IPADDRESS (ospf_top->router_id);
      else
	return SNMP_IPADDRESS (ospf_empty_addr);
      break;
    case OSPFADMINSTAT:		/* 2 */
      /* The administrative status of OSPF in the router. */
      if (ospf_admin_stat ())
	return SNMP_INTEGER (OSPF_STATUS_ENABLED);
      else
	return SNMP_INTEGER (OSPF_STATUS_DISABLED);
      break;
    case OSPFVERSIONNUMBER:	/* 3 */
      /* OSPF version 2. */
      return SNMP_INTEGER (OSPF_VERSION);
      break;
    case OSPFAREABDRRTRSTATUS:	/* 4 */
      /* Area Border router status. */
      if (ospf_top && CHECK_FLAG (ospf_top->flags, OSPF_FLAG_ABR))
	return SNMP_INTEGER (SNMP_TRUE);
      else
	return SNMP_INTEGER (SNMP_FALSE);
      break;
    case OSPFASBDRRTRSTATUS:	/* 5 */
      /* AS Border router status. */
      if (ospf_top && CHECK_FLAG (ospf_top->flags, OSPF_FLAG_ASBR))
	return SNMP_INTEGER (SNMP_TRUE);
      else
	return SNMP_INTEGER (SNMP_FALSE);
      break;
    case OSPFEXTERNLSACOUNT:	/* 6 */
      /* External LSA counts. */
      if (ospf_top)
	return SNMP_INTEGER (ospf_lsdb_count_all (ospf_top->lsdb));
      else
	return SNMP_INTEGER (0);
      break;
    case OSPFEXTERNLSACKSUMSUM:	/* 7 */
      /* External LSA checksum. */
      return SNMP_INTEGER (0);
      break;
    case OSPFTOSSUPPORT:	/* 8 */
      /* TOS is not supported. */
      return SNMP_INTEGER (SNMP_FALSE);
      break;
    case OSPFORIGINATENEWLSAS:	/* 9 */
      /* The number of new link-state advertisements. */
      if (ospf_top)
	return SNMP_INTEGER (ospf_top->lsa_originate_count);
      else
	return SNMP_INTEGER (0);
      break;
    case OSPFRXNEWLSAS:		/* 10 */
      /* The number of link-state advertisements received determined
         to be new instantiations. */
      if (ospf_top)
	return SNMP_INTEGER (ospf_top->rx_lsa_count);
      else
	return SNMP_INTEGER (0);
      break;
    case OSPFEXTLSDBLIMIT:	/* 11 */
      /* There is no limit for the number of non-default
         AS-external-LSAs. */
      return SNMP_INTEGER (-1);
      break;
    case OSPFMULTICASTEXTENSIONS: /* 12 */
      /* Multicast Extensions to OSPF is not supported. */
      return SNMP_INTEGER (0);
      break;
    case OSPFEXITOVERFLOWINTERVAL: /* 13 */
      /* Overflow is not supported. */
      return SNMP_INTEGER (0);
      break;
    case OSPFDEMANDEXTENSIONS:	/* 14 */
      /* Demand routing is not supported. */
      return SNMP_INTEGER (SNMP_FALSE);
      break;
    default:
      return NULL;
    }
  return NULL;
}

struct ospf_area *
ospf_area_lookup_next (struct in_addr *area_id, int first)
{
  struct ospf_area *area;
  listnode node;

  if (! ospf_top)
    return NULL;

  if (first)
    {
      node = listhead (ospf_top->areas);
      if (node)
	{
	  area = getdata (node);
	  *area_id = area->area_id;
	  return area;
	}
      return NULL;
    }
  for (node = listhead (ospf_top->areas); node; nextnode (node))
    {
      area = getdata (node);

      if (ntohl (area->area_id.s_addr) > ntohl (area_id->s_addr))
	{
	  *area_id = area->area_id;
	  return area;
	}
    }
  return NULL;
}

struct ospf_area *
ospfAreaLookup (struct variable *v, oid name[], size_t *length,
		struct in_addr *addr, int exact)
{
  int len;
  struct ospf_area *area;

  if (! ospf_top)
    return NULL;

  if (exact)
    {
      /* Length is insufficient to lookup OSPF area. */
      if (*length - v->namelen != sizeof (struct in_addr))
	return NULL;

      oid2in_addr (name + v->namelen, sizeof (struct in_addr), addr);

      area = ospf_area_lookup_by_area_id (*addr);

      return area;
    }
  else
    {
      len = *length - v->namelen;
      if (len > 4)
	len = 4;
      
      oid2in_addr (name + v->namelen, len, addr);

      area = ospf_area_lookup_next (addr, len == 0 ? 1 : 0);

      if (area == NULL)
	return NULL;

      oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
      *length = sizeof (struct in_addr) + v->namelen;

      return area;
    }
  return NULL;
}

static u_char *
ospfAreaEntry (struct variable *v, oid *name, size_t *length, int exact,
	       size_t *var_len, WriteMethod **write_method)
{
  struct ospf_area *area;
  struct in_addr addr;

  memset (&addr, 0, sizeof (struct in_addr));

  area = ospfAreaLookup (v, name, length, &addr, exact);
  if (! area)
    return NULL;
  
  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFAREAID:		/* 1 */
      return SNMP_IPADDRESS (area->area_id);
      break;
    case OSPFAUTHTYPE:		/* 2 */
      return SNMP_INTEGER (area->auth_type);
      break;
    case OSPFIMPORTASEXTERN:	/* 3 */
      return SNMP_INTEGER (area->external_routing + 1);
      break;
    case OSPFSPFRUNS:		/* 4 */
      return SNMP_INTEGER (area->spf_calculation);
      break;
    case OSPFAREABDRRTRCOUNT:	/* 5 */
      return SNMP_INTEGER (area->abr_count);
      break;
    case OSPFASBDRRTRCOUNT:	/* 6 */
      return SNMP_INTEGER (area->asbr_count);
      break;
    case OSPFAREALSACOUNT:	/* 7 */
      return SNMP_INTEGER (area->lsdb->total);
      break;
    case OSPFAREALSACKSUMSUM:	/* 8 */
      return SNMP_INTEGER (0);
      break;
    case OSPFAREASUMMARY:	/* 9 */
#define OSPF_noAreaSummary   1
#define OSPF_sendAreaSummary 2
      if (area->no_summary)
	return SNMP_INTEGER (OSPF_noAreaSummary);
      else
	return SNMP_INTEGER (OSPF_sendAreaSummary);
      break;
    case OSPFAREASTATUS:	/* 10 */
      return SNMP_INTEGER (SNMP_VALID);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_area *
ospf_stub_area_lookup_next (struct in_addr *area_id, int first)
{
  struct ospf_area *area;
  listnode node;

  if (! ospf_top)
    return NULL;

  for (node = listhead (ospf_top->areas); node; nextnode (node))
    {
      area = getdata (node);

      if (area->external_routing == OSPF_AREA_STUB)
	{
	  if (first)
	    {
	      *area_id = area->area_id;
	      return area;
	    }
	  else if (ntohl (area->area_id.s_addr) > ntohl (area_id->s_addr))
	    {
	      *area_id = area->area_id;
	      return area;
	    }
	}
    }
  return NULL;
}

struct ospf_area *
ospfStubAreaLookup (struct variable *v, oid name[], size_t *length,
		    struct in_addr *addr, int exact)
{
  int len;
  struct ospf_area *area;

  if (! ospf_top)
    return NULL;

  /* Exact lookup. */
  if (exact)
    {
      /* ospfStubAreaID + ospfStubTOS. */
      if (*length != v->namelen + sizeof (struct in_addr) + 1)
	return NULL;

      /* Check ospfStubTOS is zero. */
      if (name[*length - 1] != 0)
	return NULL;

      oid2in_addr (name + v->namelen, sizeof (struct in_addr), addr);

      area = ospf_area_lookup_by_area_id (*addr);

      if (area->external_routing == OSPF_AREA_STUB)
	return area;
      else
	return NULL;
    }
  else
    {
      len = *length - v->namelen;
      if (len > 4)
	len = 4;
      
      oid2in_addr (name + v->namelen, len, addr);

      area = ospf_stub_area_lookup_next (addr, len == 0 ? 1 : 0);

      if (area == NULL)
	return NULL;

      oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
      /* Set TOS 0. */
      name[v->namelen + sizeof (struct in_addr)] = 0;
      *length = v->namelen + sizeof (struct in_addr) + 1;

      return area;
    }
  return NULL;
}

static u_char *
ospfStubAreaEntry (struct variable *v, oid *name, size_t *length,
		   int exact, size_t *var_len, WriteMethod **write_method)
{
  struct ospf_area *area;
  struct in_addr addr;

  memset (&addr, 0, sizeof (struct in_addr));

  area = ospfStubAreaLookup (v, name, length, &addr, exact);
  if (! area)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFSTUBAREAID:	/* 1 */
      /* OSPF stub area id. */
      return SNMP_IPADDRESS (area->area_id);
      break;
    case OSPFSTUBTOS:		/* 2 */
      /* TOS value is not supported. */
      return SNMP_INTEGER (0);
      break;
    case OSPFSTUBMETRIC:	/* 3 */
      /* Default cost to stub area. */
      return SNMP_INTEGER (area->default_cost);
      break;
    case OSPFSTUBSTATUS:	/* 4 */
      /* Status of the stub area. */
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFSTUBMETRICTYPE:	/* 5 */
      /* OSPF Metric type. */
#define OSPF_ospfMetric     1
#define OSPF_comparableCost 2
#define OSPF_nonComparable  3
      return SNMP_INTEGER (OSPF_ospfMetric);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_lsa *
lsdb_lookup_next (struct ospf_area *area, u_char *type, int type_next,
		  struct in_addr *ls_id, int ls_id_next,
		  struct in_addr *router_id, int router_id_next)
{
  struct ospf_lsa *lsa;
  int i;

  if (type_next)
    i = OSPF_MIN_LSA;
  else
    i = *type;

  for (; i < OSPF_MAX_LSA; i++)
    {
      *type = i;

      lsa = ospf_lsdb_lookup_by_id_next (area->lsdb, *type, *ls_id, *router_id,
					ls_id_next);
      if (lsa)
	return lsa;

      ls_id_next = 1;
    }
  return NULL;
}

struct ospf_lsa *
ospfLsdbLookup (struct variable *v, oid *name, size_t *length,
		struct in_addr *area_id, u_char *type,
		struct in_addr *ls_id, struct in_addr *router_id, int exact)
{
  struct ospf_area *area;
  struct ospf_lsa *lsa;
  int len;
  int type_next;
  int ls_id_next;
  int router_id_next;
  oid *offset;
  int offsetlen;

#define OSPF_LSDB_ENTRY_OFFSET \
          (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE + IN_ADDR_SIZE)

  if (exact)
    {
      /* Area ID + Type + LS ID + Router ID. */
      if (*length - v->namelen != OSPF_LSDB_ENTRY_OFFSET)
	return NULL;
      
      /* Set OID offset for Area ID. */
      offset = name + v->namelen;

      /* Lookup area first. */
      oid2in_addr (offset, IN_ADDR_SIZE, area_id);
      area = ospf_area_lookup_by_area_id (*area_id);
      if (! area)
	return NULL;
      offset += IN_ADDR_SIZE;

      /* Type. */
      *type = *offset;
      offset++;

      /* LS ID. */
      oid2in_addr (offset, IN_ADDR_SIZE, ls_id);
      offset += IN_ADDR_SIZE;

      /* Router ID. */
      oid2in_addr (offset, IN_ADDR_SIZE, router_id);

      /* Lookup LSDB. */
      return ospf_lsdb_lookup_by_id (area->lsdb, *type, *ls_id, *router_id);
    }
  else
    {
      /* Get variable length. */
      offset = name + v->namelen;
      offsetlen = *length - v->namelen;
      len = offsetlen;

      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;

      oid2in_addr (offset, len, area_id);

      /* First we search area. */
      if (len == IN_ADDR_SIZE)
	area = ospf_area_lookup_by_area_id (*area_id);
      else
	area = ospf_area_lookup_next (area_id, len == 0 ? 1 : 0);

      if (area == NULL)
	return NULL;

      do 
	{
	  /* Next we lookup type. */
	  offset += IN_ADDR_SIZE;
	  offsetlen -= IN_ADDR_SIZE;
	  len = offsetlen;

	  if (len <= 0)
	    type_next = 1;
	  else
	    {
	      len = 1;
	      type_next = 0;
	      *type = *offset;
	    }
	
	  /* LS ID. */
	  offset++;
	  offsetlen--;
	  len = offsetlen;

	  if (len <= 0)
	    ls_id_next = 1;
	  else
	    {
	      ls_id_next = 0;
	      if (len > IN_ADDR_SIZE)
		len = IN_ADDR_SIZE;

	      oid2in_addr (offset, len, ls_id);
	    }

	  /* Router ID. */
	  offset += IN_ADDR_SIZE;
	  offsetlen -= IN_ADDR_SIZE;
	  len = offsetlen;

	  if (len <= 0)
	    router_id_next = 1;
	  else
	    {
	      router_id_next = 0;
	      if (len > IN_ADDR_SIZE)
		len = IN_ADDR_SIZE;

	      oid2in_addr (offset, len, router_id);
	    }

	  lsa = lsdb_lookup_next (area, type, type_next, ls_id, ls_id_next,
				  router_id, router_id_next);

	  if (lsa)
	    {
	      /* Fill in length. */
	      *length = v->namelen + OSPF_LSDB_ENTRY_OFFSET;

	      /* Fill in value. */
	      offset = name + v->namelen;
	      oid_copy_addr (offset, area_id, IN_ADDR_SIZE);
	      offset += IN_ADDR_SIZE;
	      *offset = lsa->data->type;
	      offset++;
	      oid_copy_addr (offset, &lsa->data->id, IN_ADDR_SIZE);
	      offset += IN_ADDR_SIZE;
	      oid_copy_addr (offset, &lsa->data->adv_router, IN_ADDR_SIZE);
	    
	      return lsa;
	    }
	}
      while ((area = ospf_area_lookup_next (area_id, 0)) != NULL);
    }
  return NULL;
}

static u_char *
ospfLsdbEntry (struct variable *v, oid *name, size_t *length, int exact,
	       size_t *var_len, WriteMethod **write_method)
{
  struct ospf_lsa *lsa;
  struct lsa_header *lsah;
  struct in_addr area_id;
  u_char type;
  struct in_addr ls_id;
  struct in_addr router_id;

  /* INDEX { ospfLsdbAreaId, ospfLsdbType,
     ospfLsdbLsid, ospfLsdbRouterId } */

  memset (&area_id, 0, sizeof (struct in_addr));
  type = 0;
  memset (&ls_id, 0, sizeof (struct in_addr));
  memset (&router_id, 0, sizeof (struct in_addr));

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  lsa = ospfLsdbLookup (v, name, length, &area_id, &type, &ls_id, &router_id,
			exact);
  if (! lsa)
    return NULL;

  lsah = lsa->data;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFLSDBAREAID:	/* 1 */
      return SNMP_IPADDRESS (lsa->area->area_id);
      break;
    case OSPFLSDBTYPE:		/* 2 */
      return SNMP_INTEGER (lsah->type);
      break;
    case OSPFLSDBLSID:		/* 3 */
      return SNMP_IPADDRESS (lsah->id);
      break;
    case OSPFLSDBROUTERID:	/* 4 */
      return SNMP_IPADDRESS (lsah->adv_router);
      break;
    case OSPFLSDBSEQUENCE:	/* 5 */
      return SNMP_INTEGER (lsah->ls_seqnum);
      break;
    case OSPFLSDBAGE:		/* 6 */
      return SNMP_INTEGER (lsah->ls_age);
      break;
    case OSPFLSDBCHECKSUM:	/* 7 */
      return SNMP_INTEGER (lsah->checksum);
      break;
    case OSPFLSDBADVERTISEMENT:	/* 8 */
      *var_len = ntohs (lsah->length);
      return (u_char *) lsah;
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_area_range *
ospfAreaRangeLookup (struct variable *v, oid *name, size_t *length,
		     struct in_addr *area_id, struct in_addr *range_net,
		     int exact)
{
  oid *offset;
  int offsetlen;
  int len;
  struct ospf_area *area;
  struct ospf_area_range *range;
  struct prefix_ipv4 p;
  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_BITLEN;

  if (exact) 
    {
      /* Area ID + Range Network. */
      if (v->namelen + IN_ADDR_SIZE + IN_ADDR_SIZE != *length)
	return NULL;

      /* Set OID offset for Area ID. */
      offset = name + v->namelen;

      /* Lookup area first. */
      oid2in_addr (offset, IN_ADDR_SIZE, area_id);

      area = ospf_area_lookup_by_area_id (*area_id);
      if (! area)
	return NULL;

      offset += IN_ADDR_SIZE;

      /* Lookup area range. */
      oid2in_addr (offset, IN_ADDR_SIZE, range_net);
      p.prefix = *range_net;

      return ospf_area_range_lookup (area, &p);
    }
  else
    {
      /* Set OID offset for Area ID. */
      offset = name + v->namelen;
      offsetlen = *length - v->namelen;

      len = offsetlen;
      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;

      oid2in_addr (offset, len, area_id);

      /* First we search area. */
      if (len == IN_ADDR_SIZE)
	area = ospf_area_lookup_by_area_id (*area_id);
      else
	area = ospf_area_lookup_next (area_id, len == 0 ? 1 : 0);

      if (area == NULL)
	return NULL;

      do 
	{
	  offset += IN_ADDR_SIZE;
	  offsetlen -= IN_ADDR_SIZE;
	  len = offsetlen;

	  if (len < 0)
	    len = 0;
	  if (len > IN_ADDR_SIZE)
	    len = IN_ADDR_SIZE;

	  oid2in_addr (offset, len, range_net);

	  range = ospf_area_range_lookup_next (area, range_net,
					       len == 0 ? 1 : 0);

	  if (range)
	    {
	      /* Fill in length. */
	      *length = v->namelen + IN_ADDR_SIZE + IN_ADDR_SIZE;

	      /* Fill in value. */
	      offset = name + v->namelen;
	      oid_copy_addr (offset, area_id, IN_ADDR_SIZE);
	      offset += IN_ADDR_SIZE;
	      oid_copy_addr (offset, range_net, IN_ADDR_SIZE);

	      return range;
	    }
	}
      while ((area = ospf_area_lookup_next (area_id, 0)) != NULL);
    }
  return NULL;
}

static u_char *
ospfAreaRangeEntry (struct variable *v, oid *name, size_t *length, int exact,
		    size_t *var_len, WriteMethod **write_method)
{
  struct ospf_area_range *range;
  struct in_addr area_id;
  struct in_addr range_net;
  struct in_addr mask;
  
  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  memset (&area_id, 0, IN_ADDR_SIZE);
  memset (&range_net, 0, IN_ADDR_SIZE);

  range = ospfAreaRangeLookup (v, name, length, &area_id, &range_net, exact);
  if (! range)
    return NULL;

  /* Convert prefixlen to network mask format. */
  masklen2ip (range->subst_masklen, &mask);

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFAREARANGEAREAID:	/* 1 */
      return SNMP_IPADDRESS (area_id);
      break;
    case OSPFAREARANGENET:	/* 2 */
      return SNMP_IPADDRESS (range_net);
      break;
    case OSPFAREARANGEMASK:	/* 3 */
      return SNMP_IPADDRESS (mask);
      break;
    case OSPFAREARANGESTATUS:	/* 4 */
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFAREARANGEEFFECT:	/* 5 */
#define OSPF_advertiseMatching      1
#define OSPF_doNotAdvertiseMatching 2
      return SNMP_INTEGER (OSPF_advertiseMatching);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_nbr_nbma *
ospfHostLookup (struct variable *v, oid *name, size_t *length,
		struct in_addr *addr, int exact)
{
  int len;
  struct ospf_nbr_nbma *nbr_nbma;

  if (! ospf_top)
    return NULL;

  if (exact)
    {
      /* INDEX { ospfHostIpAddress, ospfHostTOS } */
      if (*length != v->namelen + IN_ADDR_SIZE + 1)
	return NULL;

      /* Check ospfHostTOS. */
      if (name[*length - 1] != 0)
	return NULL;

      oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);

      nbr_nbma = ospf_nbr_nbma_lookup (ospf_top, *addr);

      return nbr_nbma;
    }
  else
    {
      len = *length - v->namelen;
      if (len > 4)
	len = 4;
      
      oid2in_addr (name + v->namelen, len, addr);

      nbr_nbma = ospf_nbr_nbma_lookup_next (addr, len == 0 ? 1 : 0);

      if (nbr_nbma == NULL)
	return NULL;

      oid_copy_addr (name + v->namelen, addr, IN_ADDR_SIZE);

      /* Set TOS 0. */
      name[v->namelen + IN_ADDR_SIZE] = 0;

      *length = v->namelen + IN_ADDR_SIZE + 1;

      return nbr_nbma;
    }
  return NULL;
}

static u_char *
ospfHostEntry (struct variable *v, oid *name, size_t *length, int exact,
	       size_t *var_len, WriteMethod **write_method)
{
  struct ospf_nbr_nbma *nbr_nbma;
  struct ospf_interface *oi;
  struct in_addr addr;

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  memset (&addr, 0, sizeof (struct in_addr));

  nbr_nbma = ospfHostLookup (v, name, length, &addr, exact);
  if (nbr_nbma == NULL)
    return NULL;

  oi = nbr_nbma->oi;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFHOSTIPADDRESS:	/* 1 */
      return SNMP_IPADDRESS (nbr_nbma->addr);
      break;
    case OSPFHOSTTOS:		/* 2 */
      return SNMP_INTEGER (0);
      break;
    case OSPFHOSTMETRIC:	/* 3 */
      if (oi)
	return SNMP_INTEGER (oi->output_cost);
      else
	return SNMP_INTEGER (1);
      break;
    case OSPFHOSTSTATUS:	/* 4 */
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFHOSTAREAID:	/* 5 */
      if (oi && oi->area)
	return SNMP_IPADDRESS (oi->area->area_id);
      else
	return SNMP_IPADDRESS (ospf_empty_addr);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct list *ospf_snmp_iflist;

struct ospf_snmp_if
{
  struct in_addr addr;
  unsigned int ifindex;
  struct interface *ifp;
};

struct ospf_snmp_if *
ospf_snmp_if_new ()
{
  struct ospf_snmp_if *osif;

  osif = XMALLOC (0, sizeof (struct ospf_snmp_if));
  memset (osif, 0, sizeof (struct ospf_snmp_if));
  return osif;
}

void
ospf_snmp_if_free (struct ospf_snmp_if *osif)
{
  XFREE (0, osif);
}

void
ospf_snmp_if_delete (struct interface *ifp)
{
  struct listnode *nn;
  struct ospf_snmp_if *osif;

  LIST_LOOP (ospf_snmp_iflist, osif, nn)
    {
      if (osif->ifp == ifp)
	{
	  list_delete_node (ospf_snmp_iflist, nn);
	  ospf_snmp_if_free (osif);
	  return;
	}
    }
}

void
ospf_snmp_if_update (struct interface *ifp)
{
  struct listnode *nn;
  struct listnode *pn;
  struct connected *ifc;
  struct prefix *p;
  struct ospf_snmp_if *osif;
  struct in_addr *addr;
  unsigned int ifindex;

  ospf_snmp_if_delete (ifp);

  p = NULL;
  addr = NULL;
  ifindex = 0;

  /* Lookup first IPv4 address entry. */
  LIST_LOOP (ifp->connected, ifc, nn)
    {
      if (if_is_pointopoint (ifp))
	p = ifc->destination;
      else
	p = ifc->address;

      if (p->family == AF_INET)
	{
	  addr = &p->u.prefix4;
	  break;
	}
    }
  if (! addr)
    ifindex = ifp->ifindex;

  /* Add interface to the list. */
  pn = NULL;
  LIST_LOOP (ospf_snmp_iflist, osif, nn)
    {
      if (addr)
	{
	  if (ntohl (osif->addr.s_addr) > ntohl (addr->s_addr))
	    break;
	}
      else
	{
	  /* Unnumbered interface. */
	  if (osif->addr.s_addr != 0 || osif->ifindex > ifindex)
	    break;
	}
      pn = nn;
    }

  osif = ospf_snmp_if_new ();
  if (addr)
    osif->addr = *addr;
  else
    osif->ifindex = ifindex;
  osif->ifp = ifp;

  listnode_add_after (ospf_snmp_iflist, pn, osif);
}

struct interface *
ospf_snmp_if_lookup (struct in_addr *ifaddr, unsigned int *ifindex)
{
  struct listnode *nn;
  struct ospf_snmp_if *osif;

  LIST_LOOP (ospf_snmp_iflist, osif, nn)
    {  
      if (ifaddr->s_addr)
	{
	  if (IPV4_ADDR_SAME (&osif->addr, ifaddr))
	    return osif->ifp;
	}
      else
	{
	  if (osif->ifindex == *ifindex)
	    return osif->ifp;
	}
    }
  return NULL;
}

struct interface *
ospf_snmp_if_lookup_next (struct in_addr *ifaddr, unsigned int *ifindex,
			  int ifaddr_next, int ifindex_next)
{
  struct ospf_snmp_if *osif;
  struct listnode *nn;

  if (ifaddr_next)
    {
      nn = listhead (ospf_snmp_iflist);
      if (nn)
	{
	  osif = getdata (nn);
	  *ifaddr = osif->addr;
	  *ifindex = osif->ifindex;
	  return osif->ifp;
	}
      return NULL;
    }

  LIST_LOOP (ospf_snmp_iflist, osif, nn)
    {
      if (ifaddr->s_addr)
	{
	  if (ntohl (osif->addr.s_addr) > ntohl (ifaddr->s_addr))
	    {
	      *ifaddr = osif->addr;
	      *ifindex = osif->ifindex;
	      return osif->ifp;
	    }
	}
      else
	{
	  if (osif->ifindex > *ifindex || osif->addr.s_addr)
	    {
	      *ifaddr = osif->addr;
	      *ifindex = osif->ifindex;
	      return osif->ifp;
	    }
	}
    }
  return NULL;
}

int
ospf_snmp_iftype (struct interface *ifp)
{
#define ospf_snmp_iftype_broadcast         1
#define ospf_snmp_iftype_nbma              2
#define ospf_snmp_iftype_pointToPoint      3
#define ospf_snmp_iftype_pointToMultipoint 5
  if (if_is_broadcast (ifp))
    return ospf_snmp_iftype_broadcast;
  if (if_is_pointopoint (ifp))
    return ospf_snmp_iftype_pointToPoint;
  return ospf_snmp_iftype_broadcast;
}

struct interface *
ospfIfLookup (struct variable *v, oid *name, size_t *length,
	      struct in_addr *ifaddr, unsigned int *ifindex, int exact)
{
  int len;
  int ifaddr_next = 0;
  int ifindex_next = 0;
  struct interface *ifp;
  oid *offset;

  if (exact)
    {
      if (*length != v->namelen + IN_ADDR_SIZE + 1)
	return NULL;

      oid2in_addr (name + v->namelen, IN_ADDR_SIZE, ifaddr);
      *ifindex = name[v->namelen + IN_ADDR_SIZE];

      return ospf_snmp_if_lookup (ifaddr, ifindex);
    }
  else
    {
      len = *length - v->namelen;
      if (len >= IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;
      if (len <= 0)
	ifaddr_next = 1;

      oid2in_addr (name + v->namelen, len, ifaddr);

      len = *length - v->namelen - IN_ADDR_SIZE;
      if (len >= 1)
	len = 1;
      else
	ifindex_next = 1;

      if (len == 1)
	*ifindex = name[v->namelen + IN_ADDR_SIZE];

      ifp = ospf_snmp_if_lookup_next (ifaddr, ifindex, ifaddr_next,
				      ifindex_next);
      if (ifp)
	{
	  *length = v->namelen + IN_ADDR_SIZE + 1;
	  offset = name + v->namelen;
	  oid_copy_addr (offset, ifaddr, IN_ADDR_SIZE);
	  offset += IN_ADDR_SIZE;
	  *offset = *ifindex;
	  return ifp;
	}
    }
  return NULL;
}

static u_char *
ospfIfEntry (struct variable *v, oid *name, size_t *length, int exact,
	     size_t  *var_len, WriteMethod **write_method)
{
  struct interface *ifp;
  unsigned int ifindex;
  struct in_addr ifaddr;
  struct ospf_interface *oi;

  ifindex = 0;
  memset (&ifaddr, 0, sizeof (struct in_addr));

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  ifp = ospfIfLookup (v, name, length, &ifaddr, &ifindex, exact);
  if (ifp == NULL)
    return NULL;

  oi = ospf_if_lookup_by_local_addr (ifp, ifaddr);
  if (oi == NULL)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFIFIPADDRESS:	/* 1 */
      return SNMP_IPADDRESS (ifaddr);
      break;
    case OSPFADDRESSLESSIF:	/* 2 */
      return SNMP_INTEGER (ifindex);
      break;
    case OSPFIFAREAID:		/* 3 */
      if (oi->area)
	return SNMP_IPADDRESS (oi->area->area_id);
      else
	return SNMP_IPADDRESS (ospf_empty_addr);
      break;
    case OSPFIFTYPE:		/* 4 */
      return SNMP_INTEGER (ospf_snmp_iftype (ifp));
      break;
    case OSPFIFADMINSTAT:	/* 5 */
      if (oi)
	return SNMP_INTEGER (OSPF_STATUS_ENABLED);
      else
	return SNMP_INTEGER (OSPF_STATUS_DISABLED);
      break;
    case OSPFIFRTRPRIORITY:	/* 6 */
      return SNMP_INTEGER (PRIORITY (oi));
      break;
    case OSPFIFTRANSITDELAY:	/* 7 */
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, transmit_delay));
      break;
    case OSPFIFRETRANSINTERVAL:	/* 8 */
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, retransmit_interval));
      break;
    case OSPFIFHELLOINTERVAL:	/* 9 */
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, v_hello));
      break;
    case OSPFIFRTRDEADINTERVAL:	/* 10 */
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, v_wait));
      break;
    case OSPFIFPOLLINTERVAL:	/* 11 */
      return SNMP_INTEGER (OSPF_POLL_INTERVAL_DEFAULT);
      break;
    case OSPFIFSTATE:		/* 12 */
      return SNMP_INTEGER (oi->state);
      break;
    case OSPFIFDESIGNATEDROUTER: /* 13 */
      return SNMP_IPADDRESS (DR (oi));
      break;
    case OSPFIFBACKUPDESIGNATEDROUTER: /* 14 */
      return SNMP_IPADDRESS (BDR (oi));
      break;
    case OSPFIFEVENTS:		/* 15 */
      return SNMP_INTEGER (oi->state_change);
      break;
    case OSPFIFAUTHKEY:		/* 16 */
      *var_len = 0;
      return (u_char *) OSPF_IF_PARAM (oi, auth_simple);
      break;
    case OSPFIFSTATUS:		/* 17 */
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFIFMULTICASTFORWARDING: /* 18 */
#define ospf_snmp_multiforward_blocked    1
#define ospf_snmp_multiforward_multicast  2
#define ospf_snmp_multiforward_unicast    3
      return SNMP_INTEGER (ospf_snmp_multiforward_blocked);
      break;
    case OSPFIFDEMAND:		/* 19 */
      return SNMP_INTEGER (SNMP_FALSE);
      break;
    case OSPFIFAUTHTYPE:	/* 20 */
      if (oi->area)
	return SNMP_INTEGER (oi->area->auth_type);
      else
	return SNMP_INTEGER (0);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

#define OSPF_SNMP_METRIC_VALUE 1

struct interface *
ospfIfMetricLookup (struct variable *v, oid *name, size_t *length,
		    struct in_addr *ifaddr, unsigned int *ifindex, int exact)
{
  int len;
  int ifaddr_next = 0;
  int ifindex_next = 0;
  struct interface *ifp;
  oid *offset;
  int metric;

  if (exact)
    {
      if (*length != v->namelen + IN_ADDR_SIZE + 1 + 1)
	return NULL;

      oid2in_addr (name + v->namelen, IN_ADDR_SIZE, ifaddr);
      *ifindex = name[v->namelen + IN_ADDR_SIZE];
      metric = name[v->namelen + IN_ADDR_SIZE + 1];

      if (metric != OSPF_SNMP_METRIC_VALUE)
	return NULL;

      return ospf_snmp_if_lookup (ifaddr, ifindex);
    }
  else
    {
      len = *length - v->namelen;
      if (len >= IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;
      else
	ifaddr_next = 1;

      oid2in_addr (name + v->namelen, len, ifaddr);

      len = *length - v->namelen - IN_ADDR_SIZE;
      if (len >= 1)
	len = 1;
      else
	ifindex_next = 1;

      if (len == 1)
	*ifindex = name[v->namelen + IN_ADDR_SIZE];

      ifp = ospf_snmp_if_lookup_next (ifaddr, ifindex, ifaddr_next,
				      ifindex_next);
      if (ifp)
	{
	  *length = v->namelen + IN_ADDR_SIZE + 1 + 1;
	  offset = name + v->namelen;
	  oid_copy_addr (offset, ifaddr, IN_ADDR_SIZE);
	  offset += IN_ADDR_SIZE;
	  *offset = *ifindex;
	  offset++;
	  *offset = OSPF_SNMP_METRIC_VALUE;
	  return ifp;
	}
    }
  return NULL;
}

static u_char *
ospfIfMetricEntry (struct variable *v, oid *name, size_t *length, int exact,
		   size_t *var_len, WriteMethod **write_method)
{
  /* Currently we support metric 1 only. */
  struct interface *ifp;
  unsigned int ifindex;
  struct in_addr ifaddr;
  struct ospf_interface *oi;

  ifindex = 0;
  memset (&ifaddr, 0, sizeof (struct in_addr));

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  ifp = ospfIfMetricLookup (v, name, length, &ifaddr, &ifindex, exact);
  if (ifp == NULL)
    return NULL;

  oi = ospf_if_lookup_by_local_addr (ifp, ifaddr);
  if (oi == NULL)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFIFMETRICIPADDRESS:
      return SNMP_IPADDRESS (ifaddr);
      break;
    case OSPFIFMETRICADDRESSLESSIF:
      return SNMP_INTEGER (ifindex);
      break;
    case OSPFIFMETRICTOS:
      return SNMP_INTEGER (0);
      break;
    case OSPFIFMETRICVALUE:
      return SNMP_INTEGER (OSPF_SNMP_METRIC_VALUE);
      break;
    case OSPFIFMETRICSTATUS:
      return SNMP_INTEGER (1);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct route_table *ospf_snmp_vl_table;

void
ospf_snmp_vl_add (struct ospf_vl_data *vl_data)
{
  struct prefix_ls lp;
  struct route_node *rn;

  memset (&lp, 0, sizeof (struct prefix_ls));
  lp.family = 0;
  lp.prefixlen = 64;
  lp.id = vl_data->vl_area_id;
  lp.adv_router = vl_data->vl_peer;

  rn = route_node_get (ospf_snmp_vl_table, (struct prefix *) &lp);
  rn->info = vl_data;
}

void
ospf_snmp_vl_delete (struct ospf_vl_data *vl_data)
{
  struct prefix_ls lp;
  struct route_node *rn;

  memset (&lp, 0, sizeof (struct prefix_ls));
  lp.family = 0;
  lp.prefixlen = 64;
  lp.id = vl_data->vl_area_id;
  lp.adv_router = vl_data->vl_peer;

  rn = route_node_lookup (ospf_snmp_vl_table, (struct prefix *) &lp);
  if (! rn)
    return;
  rn->info = NULL;
  route_unlock_node (rn);
  route_unlock_node (rn);
}

struct ospf_vl_data *
ospf_snmp_vl_lookup (struct in_addr *area_id, struct in_addr *neighbor)
{
  struct prefix_ls lp;
  struct route_node *rn;
  struct ospf_vl_data *vl_data;

  memset (&lp, 0, sizeof (struct prefix_ls));
  lp.family = 0;
  lp.prefixlen = 64;
  lp.id = *area_id;
  lp.adv_router = *neighbor;

  rn = route_node_lookup (ospf_snmp_vl_table, (struct prefix *) &lp);
  if (rn)
    {
      vl_data = rn->info;
      route_unlock_node (rn);
      return vl_data;
    }
  return NULL;
}

struct ospf_vl_data *
ospf_snmp_vl_lookup_next (struct in_addr *area_id, struct in_addr *neighbor,
			  int first)
{
  struct prefix_ls lp;
  struct route_node *rn;
  struct ospf_vl_data *vl_data;

  memset (&lp, 0, sizeof (struct prefix_ls));
  lp.family = 0;
  lp.prefixlen = 64;
  lp.id = *area_id;
  lp.adv_router = *neighbor;

  if (first)
    rn = route_top (ospf_snmp_vl_table);
  else
    {
      rn = route_node_get (ospf_snmp_vl_table, (struct prefix *) &lp);
      rn = route_next (rn);
    }

  for (; rn; rn = route_next (rn))
    if (rn->info)
      break;

  if (rn && rn->info)
    {
      vl_data = rn->info;
      *area_id = vl_data->vl_area_id;
      *neighbor = vl_data->vl_peer;
      route_unlock_node (rn);
      return vl_data;
    }
  return NULL;
}

struct ospf_vl_data *
ospfVirtIfLookup (struct variable *v, oid *name, size_t *length,
		  struct in_addr *area_id, struct in_addr *neighbor, int exact)
{
  int first;
  int len;
  struct ospf_vl_data *vl_data;

  if (exact)
    {
      if (*length != v->namelen + IN_ADDR_SIZE + IN_ADDR_SIZE)
	return NULL;

      oid2in_addr (name + v->namelen, IN_ADDR_SIZE, area_id);
      oid2in_addr (name + v->namelen + IN_ADDR_SIZE, IN_ADDR_SIZE, neighbor);

      return ospf_snmp_vl_lookup (area_id, neighbor);
    }
  else
    {
      first = 0;

      len = *length - v->namelen;
      if (len <= 0)
	first = 1;
      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;
      oid2in_addr (name + v->namelen, len, area_id);

      len = *length - v->namelen - IN_ADDR_SIZE;
      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;
      oid2in_addr (name + v->namelen + IN_ADDR_SIZE, len, neighbor);

      vl_data = ospf_snmp_vl_lookup_next (area_id, neighbor, first);

      if (vl_data)
	{
	  *length = v->namelen + IN_ADDR_SIZE + IN_ADDR_SIZE;
	  oid_copy_addr (name + v->namelen, area_id, IN_ADDR_SIZE);
	  oid_copy_addr (name + v->namelen + IN_ADDR_SIZE, neighbor,
			 IN_ADDR_SIZE);
	  return vl_data;
	}
    }
  return NULL;
}

static u_char *
ospfVirtIfEntry (struct variable *v, oid *name, size_t *length, int exact,
		 size_t  *var_len, WriteMethod **write_method)
{
  struct ospf_vl_data *vl_data;
  struct ospf_interface *oi;
  struct in_addr area_id;
  struct in_addr neighbor;

  memset (&area_id, 0, sizeof (struct in_addr));
  memset (&neighbor, 0, sizeof (struct in_addr));

  vl_data = ospfVirtIfLookup (v, name, length, &area_id, &neighbor, exact);
  if (! vl_data)
    return NULL;
  oi = vl_data->vl_oi;
  if (! oi)
    return NULL;
  
  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFVIRTIFAREAID:
      return SNMP_IPADDRESS (area_id);
      break;
    case OSPFVIRTIFNEIGHBOR:
      return SNMP_IPADDRESS (neighbor);
      break;
    case OSPFVIRTIFTRANSITDELAY:
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, transmit_delay));
      break;
    case OSPFVIRTIFRETRANSINTERVAL:
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, retransmit_interval));
      break;
    case OSPFVIRTIFHELLOINTERVAL:
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, v_hello));
      break;
    case OSPFVIRTIFRTRDEADINTERVAL:
      return SNMP_INTEGER (OSPF_IF_PARAM (oi, v_wait));
      break;
    case OSPFVIRTIFSTATE:
      return SNMP_INTEGER (oi->state);
      break;
    case OSPFVIRTIFEVENTS:
      return SNMP_INTEGER (oi->state_change);
      break;
    case OSPFVIRTIFAUTHKEY:
      *var_len = 0;
      return (u_char *) OSPF_IF_PARAM (oi, auth_simple);
      break;
    case OSPFVIRTIFSTATUS:
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFVIRTIFAUTHTYPE:
      if (oi->area)
	return SNMP_INTEGER (oi->area->auth_type);
      else
	return SNMP_INTEGER (0);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_neighbor *
ospf_snmp_nbr_lookup (struct in_addr *nbr_addr, unsigned int *ifindex)
{
  struct listnode *nn;
  struct ospf_interface *oi;
  struct ospf_neighbor *nbr;
  struct route_node *rn;

  LIST_LOOP (ospf_top->oiflist, oi, nn)
    {
      for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
	if ((nbr = rn->info) != NULL
	    && nbr != oi->nbr_self
	    && nbr->state != NSM_Down
	    && nbr->src.s_addr != 0)
	  {
	    if (IPV4_ADDR_SAME (&nbr->src, nbr_addr))
	      {
		route_unlock_node (rn);
		return nbr;
	      }
	  }
    }
  return NULL;
}

struct ospf_neighbor *
ospf_snmp_nbr_lookup_next (struct in_addr *nbr_addr, unsigned int *ifindex,
			   int first)
{
  struct listnode *nn;
  struct ospf_interface *oi;
  struct ospf_neighbor *nbr;
  struct route_node *rn;
  struct ospf_neighbor *min = NULL;

  LIST_LOOP (ospf_top->oiflist, oi, nn)
    {
      for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
	if ((nbr = rn->info) != NULL
	    && nbr != oi->nbr_self
	    && nbr->state != NSM_Down
	    && nbr->src.s_addr != 0)
	  {
	    if (first)
	      {
		if (! min)
		  min = nbr;
		else if (ntohl (nbr->src.s_addr) < ntohl (min->src.s_addr))
		  min = nbr;
	      }
	    else if (ntohl (nbr->src.s_addr) > ntohl (nbr_addr->s_addr))
	      {
		if (! min)
		  min = nbr;
		else if (ntohl (nbr->src.s_addr) < ntohl (min->src.s_addr))
		  min = nbr;
	      }
	  }
    }
  if (min)
    {
      *nbr_addr = min->src;
      *ifindex = 0;
      return min;
    }
  return NULL;
}

struct ospf_neighbor *
ospfNbrLookup (struct variable *v, oid *name, size_t *length,
	       struct in_addr *nbr_addr, unsigned int *ifindex, int exact)
{
  int len;
  int first;
  struct ospf_neighbor *nbr;

  if (exact)
    {
      if (*length != v->namelen + IN_ADDR_SIZE + 1)
	return NULL;

      oid2in_addr (name + v->namelen, IN_ADDR_SIZE, nbr_addr);
      *ifindex = name[v->namelen + IN_ADDR_SIZE];

      return ospf_snmp_nbr_lookup (nbr_addr, ifindex);
    }
  else
    {
      first = 0;
      len = *length - v->namelen;

      if (len <= 0)
	first = 1;

      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;

      oid2in_addr (name + v->namelen, len, nbr_addr);

      len = *length - v->namelen - IN_ADDR_SIZE;
      if (len >= 1)
	*ifindex = name[v->namelen + IN_ADDR_SIZE];
      
      nbr = ospf_snmp_nbr_lookup_next (nbr_addr, ifindex, first);

      if (nbr)
	{
	  *length = v->namelen + IN_ADDR_SIZE + 1;
	  oid_copy_addr (name + v->namelen, nbr_addr, IN_ADDR_SIZE);
	  name[v->namelen + IN_ADDR_SIZE] = *ifindex;
	  return nbr;
	}
    }
  return NULL;
}

static u_char *
ospfNbrEntry (struct variable *v, oid *name, size_t *length, int exact,
	      size_t  *var_len, WriteMethod **write_method)
{
  struct in_addr nbr_addr;
  unsigned int ifindex;
  struct ospf_neighbor *nbr;
  struct ospf_interface *oi;

  memset (&nbr_addr, 0, sizeof (struct in_addr));
  ifindex = 0;
  
  nbr = ospfNbrLookup (v, name, length, &nbr_addr, &ifindex, exact);
  if (! nbr)
    return NULL;
  oi = nbr->oi;
  if (! oi)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFNBRIPADDR:
      return SNMP_IPADDRESS (nbr_addr);
      break;
    case OSPFNBRADDRESSLESSINDEX:
      return SNMP_INTEGER (ifindex);
      break;
    case OSPFNBRRTRID:
      return SNMP_IPADDRESS (nbr->router_id);
      break;
    case OSPFNBROPTIONS:
      return SNMP_INTEGER (oi->nbr_self->options);
      break;
    case OSPFNBRPRIORITY:
      return SNMP_INTEGER (nbr->priority);
      break;
    case OSPFNBRSTATE:
      return SNMP_INTEGER (nbr->state);
      break;
    case OSPFNBREVENTS:
      return SNMP_INTEGER (nbr->state_change);
      break;
    case OSPFNBRLSRETRANSQLEN:
      return SNMP_INTEGER (ospf_ls_retransmit_count (nbr));
      break;
    case OSPFNBMANBRSTATUS:
      return SNMP_INTEGER (SNMP_VALID);
      break;
    case OSPFNBMANBRPERMANENCE:
      return SNMP_INTEGER (2);
      break;
    case OSPFNBRHELLOSUPPRESSED:
      return SNMP_INTEGER (SNMP_FALSE);
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

static u_char *
ospfVirtNbrEntry (struct variable *v, oid *name, size_t *length, int exact,
		  size_t  *var_len, WriteMethod **write_method)
{
  struct ospf_vl_data *vl_data;
  struct in_addr area_id;
  struct in_addr neighbor;

  memset (&area_id, 0, sizeof (struct in_addr));
  memset (&neighbor, 0, sizeof (struct in_addr));

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  vl_data = ospfVirtIfLookup (v, name, length, &area_id, &neighbor, exact);
  if (! vl_data)
    return NULL;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFVIRTNBRAREA:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBRRTRID:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBRIPADDR:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBROPTIONS:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBRSTATE:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBREVENTS:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBRLSRETRANSQLEN:
      return (u_char *) NULL;
      break;
    case OSPFVIRTNBRHELLOSUPPRESSED:
      return (u_char *) NULL;
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

struct ospf_lsa *
ospfExtLsdbLookup (struct variable *v, oid *name, size_t *length, u_char *type,
		   struct in_addr *ls_id, struct in_addr *router_id, int exact)
{
  int first;
  oid *offset;
  int offsetlen;
  u_char lsa_type;
  int len;
  struct ospf_lsa *lsa;

  if (exact)
    {
      if (*length != v->namelen + 1 + IN_ADDR_SIZE + IN_ADDR_SIZE)
	return NULL;
      
      offset = name + v->namelen;

      /* Make it sure given value match to type. */
      lsa_type = *offset;
      offset++;

      if (lsa_type != *type)
	return NULL;
      
      /* LS ID. */
      oid2in_addr (offset, IN_ADDR_SIZE, ls_id);
      offset += IN_ADDR_SIZE;

      /* Router ID. */
      oid2in_addr (offset, IN_ADDR_SIZE, router_id);

      return ospf_lsdb_lookup_by_id (ospf_top->lsdb, *type, *ls_id, *router_id);
    }
  else
    {
      /* Get variable length. */
      first = 0;
      offset = name + v->namelen;
      offsetlen = *length - v->namelen;

      /* LSA type value. */
      lsa_type = *offset;
      offset++;
      offsetlen--;

      if (offsetlen <= 0 || lsa_type < OSPF_AS_EXTERNAL_LSA)
	first = 1;

      /* LS ID. */
      len = offsetlen;
      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;

      oid2in_addr (offset, len, ls_id);

      offset += IN_ADDR_SIZE;
      offsetlen -= IN_ADDR_SIZE;

      /* Router ID. */
      len = offsetlen;
      if (len > IN_ADDR_SIZE)
	len = IN_ADDR_SIZE;

      oid2in_addr (offset, len, router_id);

      lsa = ospf_lsdb_lookup_by_id_next (ospf_top->lsdb, *type, *ls_id,
					*router_id, first);

      if (lsa)
	{
	  /* Fill in length. */
	  *length = v->namelen + 1 + IN_ADDR_SIZE + IN_ADDR_SIZE;

	  /* Fill in value. */
	  offset = name + v->namelen;

	  *offset = OSPF_AS_EXTERNAL_LSA;
	  offset++;
	  oid_copy_addr (offset, &lsa->data->id, IN_ADDR_SIZE);
	  offset += IN_ADDR_SIZE;
	  oid_copy_addr (offset, &lsa->data->adv_router, IN_ADDR_SIZE);
	    
	  return lsa;
	}
    }
  return NULL;
}

static u_char *
ospfExtLsdbEntry (struct variable *v, oid *name, size_t *length, int exact,
		  size_t  *var_len, WriteMethod **write_method)
{
  struct ospf_lsa *lsa;
  struct lsa_header *lsah;
  u_char type;
  struct in_addr ls_id;
  struct in_addr router_id;

  type = OSPF_AS_EXTERNAL_LSA;
  memset (&ls_id, 0, sizeof (struct in_addr));
  memset (&router_id, 0, sizeof (struct in_addr));

  /* Check OSPF instance. */
  if (! ospf_top)
    return NULL;

  lsa = ospfExtLsdbLookup (v, name, length, &type, &ls_id, &router_id, exact);
  if (! lsa)
    return NULL;

  lsah = lsa->data;

  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFEXTLSDBTYPE:
      return SNMP_INTEGER (OSPF_AS_EXTERNAL_LSA);
      break;
    case OSPFEXTLSDBLSID:
      return SNMP_IPADDRESS (lsah->id);
      break;
    case OSPFEXTLSDBROUTERID:
      return SNMP_IPADDRESS (lsah->adv_router);
      break;
    case OSPFEXTLSDBSEQUENCE:
      return SNMP_INTEGER (lsah->ls_seqnum);
      break;
    case OSPFEXTLSDBAGE:
      return SNMP_INTEGER (lsah->ls_age);
      break;
    case OSPFEXTLSDBCHECKSUM:
      return SNMP_INTEGER (lsah->checksum);
      break;
    case OSPFEXTLSDBADVERTISEMENT:
      *var_len = ntohs (lsah->length);
      return (u_char *) lsah;
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

static u_char *
ospfAreaAggregateEntry (struct variable *v, oid *name, size_t *length,
			int exact, size_t *var_len, WriteMethod **write_method)
{
  /* Return the current value of the variable */
  switch (v->magic) 
    {
    case OSPFAREAAGGREGATEAREAID:
      return (u_char *) NULL;
      break;
    case OSPFAREAAGGREGATELSDBTYPE:
      return (u_char *) NULL;
      break;
    case OSPFAREAAGGREGATENET:
      return (u_char *) NULL;
      break;
    case OSPFAREAAGGREGATEMASK:
      return (u_char *) NULL;
      break;
    case OSPFAREAAGGREGATESTATUS:
      return (u_char *) NULL;
      break;
    case OSPFAREAAGGREGATEEFFECT:
      return (u_char *) NULL;
      break;
    default:
      return NULL;
      break;
    }
  return NULL;
}

/* Register OSPF2-MIB. */
void
ospf_snmp_init ()
{
  ospf_snmp_iflist = list_new ();
  ospf_snmp_vl_table = route_table_init ();
  smux_init (ospfd_oid, sizeof (ospfd_oid) / sizeof (oid));
  REGISTER_MIB("mibII/ospf", ospf_variables, variable, ospf_oid);
  smux_start ();
}
#endif /* HAVE_SNMP */